Zhenfu DONG and Lianmao PENG(Beijing Lab. of Electron Microscopy
,
Institute of Physics and Center for Condensed Matter Physics
,
Chinese Academy of Sciences
,
P.O.Box 2724
,
Beijing 100080
,
China)Ke LU and Zhuangqi HU(State Key Lab. for RSA
,
Institute of Meta
材料科学技术（英文）
A nanostructured Hf11Ni89 ribbon sample was prepared by melt-spinning. It was found that the as-quenched sample is composed of a major HfNi5 compound nanophase and an interfacial magnetic Ni(Hf) solid solution phase. The structure evolution of the sample was studied by using X-ray difFraction (XRD), transmission electron microscopy (TEM), difFerential scanning calorimetry (DSC), resistivity and magnetothermal analysis. Upon heating, a second precipitation process of the Ni(Hf) phase prior to grain growth wa5 detected by means of both structural analysis and physical property measurements. The measurement results are discussed based on the relationship between microstructure and physical properties.
关键词:
H.M.Li
,
Z.J.Ding
金属学报(英文版)
A new parallel Monte Carlo simulation method of secondary electron (SE) and backscattered electron images (BSE) of scanning electron microscopy (SEM) for a complex geometric structure has been developed. This paper describes briefly the simulation method and the modification to the conventional sampling method for the step length. Example simulation results have been obtained for several artificial structures.
关键词:
Monte Carlo
,
null
,
null
Scripta Materialia
An in situ ex-environmental transmission electron microscopy (TEM) study was carried out to investigate the oxidation behavior of RESn(3) (RE = Nd, La, Ce) film in a room at 18 +/- 2 degrees C with 20 +/- 5% humidity. The original RESn(3) compounds transformed into RE(OH)(3) nanocrystals and Sn clusters. This involved the selective oxidation of RE in RESn(3) and the atomic diffusion of Sn atoms. The whole oxidation behavior was discussed from the thermodynamic viewpoint, and a reaction formula was proposed to summarize the oxidation of RESn(3) under different ambient conditions. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词:
RESn(3) compounds;Oxidation;Thermodynamics;Transmission electron;microscopy (TEM);pb-free solders;whisker growth;tin whiskers;surface;joints;alloys
Philosophical Magazine Letters
In order to reveal the effect of grain boundaries (GBs) on cyclic deformation, the cyclically saturated dislocation patterns within grains and in the vicinity of GBs in a copper bicrystal with a large-angle GB and a copper multicrystal containing small-angle GBs have been observed by the electron channelling contrast technique in scanning electron microscopy. The observations for the multicrystal show that dislocation walls and persistent slip bands (PSBs) can transfer through the small-angle GBs. However, in the copper bicrystal with a large-angle GB perpendicular to the stress axis, PSBs can only form within the component grain with a relatively higher Schmid factor and cannot pass through the GB. From the experimental observations, the effect of GBs on cyclic deformation behaviour is discussed.
关键词:
single-crystals;fatigue
Metallurgical Transactions a-Physical Metallurgy and Materials Science
The influence on the apparent martensitic morphology and substructure of tilting a thin-foil specimen through various angles in the transmission electron microscope was studied in detail. It was found that the amount of laths with internal twins in low-carbon steel after quenching from high temperature is more than 40 pct; the microstructure of medium- and high-carbon steel after quenching from high temperature is completely twinned martensite. Distinguishing twinned martensite by observation of martensitic morphology and substructure using a thin-foil transmission electron microscope seems rather unreliable. Previous reports that the volume fraction of lath martensite is about 100 pct in low-carbon steel and 75 to 90 pct in medium-carbon steel quenched from high temperature perhaps need reassessment. The conditions under which internal twins within martensite could be observed in the transmission electron microscope are also discussed.
关键词:
strength
Acta Metallurgica Et Materialia
In this paper, the Ni and Ti powder mixture with equiatomic ratio was high energy ball milled and then consolidated by explosive compaction. The microstructures of as-compacted and heat treated bulk samples after explosive consolidation are investigated in detail by transmission electron microscopy (TEM) and high resolution electron microscopy (HREM). The experiment results reveal the microstructure variation during mechanical alloying in Ni-Ti binary systems. It is found that a metastable phase denoted as I phase formed during ball milling and the structure of I phase was determined by both electron diffraction and HREM. Finally, the mechanism of amorphization induced by ball milling was discussed.
关键词:
cu;amorphization;phases
Journal of Materials Science
High-resolution transmission electron microscopy images of stacking faults on (001) and (<(1)over bar 01>) planes in a beta-Si3N4 whisker were obtained and compared to image simulations. This procedure showed that the atomic structure of the four atomic planes around the (001) stacking fault plane in the beta-phase is very similar to that of the unit cell of alpha-Si3N4 crystal. The stacking fault was observed to climb under electron irradiation in the microscope.
关键词:
silicon-nitride;diffraction;composite;ceramics
